Document Detail

Effects of pH adjustment and sodium ions on sour taste intensity of organic acids.
MedLine Citation:
PMID:  19490344     Owner:  NLM     Status:  MEDLINE    
Protonated organic acid species have been shown to be the primary stimuli responsible for sour taste of organic acids. However, we have observed that sour taste may be modulated when the pH of acid solutions is raised using sodium hydroxide. Objectives were to evaluate the effect of pH adjustment on sour taste of equimolar protonated organic acid solutions and to investigate the potential roles of organic anions and sodium ions on sour taste perception. Despite equal concentrations of protonated acid species, sour taste intensity decreased significantly with increased pH for acetic, lactic, malic, and citric acids (P < 0.05). Total organic anion concentration did not explain the suppression of sour taste in solutions containing a blend of 3 organic acids with constant concentration of protonated organic acid species and hydrogen ions and variable organic anion concentrations (R(2)= 0.480, P = 0.12). Sour taste suppression in these solutions seemed to be more closely related to sodium ions added in the form of NaOH (R(2)= 0.861, P = 0.007). Addition of 20 mM NaCl to acid solutions resulted in significant suppression of sour taste (P = 0.016). However, sour taste did not decrease with further addition of NaCl up to 80 mM. Presence of sodium ions was clearly shown to decrease sour taste of organic acid solutions. Nonetheless, suppression of sour taste in pH adjusted single acid solutions was greater than what would be expected based on the sodium ion concentration alone, indicating an additional suppression mechanism may be involved.
E R D Neta; S D Johanningsmeier; M A Drake; R F McFeeters
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Journal of food science     Volume:  74     ISSN:  1750-3841     ISO Abbreviation:  J. Food Sci.     Publication Date:    2009 May-Jul
Date Detail:
Created Date:  2009-06-03     Completed Date:  2009-09-01     Revised Date:  2010-05-24    
Medline Journal Info:
Nlm Unique ID:  0014052     Medline TA:  J Food Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  S165-9     Citation Subset:  IM    
U.S. Dept. of Agriculture, Agricultural Research Service and North Carolina Agricultural Research Service, USA.
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MeSH Terms
Acetic Acid
Carboxylic Acids*
Citric Acid
Hydrogen-Ion Concentration
Lactic Acid
Middle Aged
Sodium / administration & dosage*
Taste / drug effects*
Reg. No./Substance:
0/Carboxylic Acids; 0/Cations; 0/Malates; 0/Solutions; 50-21-5/Lactic Acid; 64-19-7/Acetic Acid; 6915-15-7/malic acid; 7440-23-5/Sodium; 77-92-9/Citric Acid

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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